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JP4450307B2 - 3 group zoom lens - Google Patents

3 group zoom lens Download PDF

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Publication number
JP4450307B2
JP4450307B2 JP2003319490A JP2003319490A JP4450307B2 JP 4450307 B2 JP4450307 B2 JP 4450307B2 JP 2003319490 A JP2003319490 A JP 2003319490A JP 2003319490 A JP2003319490 A JP 2003319490A JP 4450307 B2 JP4450307 B2 JP 4450307B2
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lens
lens group
group
object side
refractive power
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JP2005084597A (en
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哲也 小里
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Fujinon Corp
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1435Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
    • G02B15/143507Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++

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  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
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Description

本発明は、CCDやCMOS等の撮像素子上に結像した画像を読み取るための3群構成のズームレンズに関し、詳しくは、デジタルカメラやビデオカメラに好適に用いられ、変倍比が3倍を超える3群ズームレンズに関する。   The present invention relates to a zoom lens having a three-group configuration for reading an image formed on an image sensor such as a CCD or a CMOS. Specifically, the zoom lens is preferably used for a digital camera or a video camera and has a zoom ratio of 3 times. It relates to a three-group zoom lens.

近年、急速に普及しつつあるデジタルカメラでは、コンパクト化を図るとともに収差補正を良好とするために3群ズームレンズが用いられており、特にフォーカシング時に最終群を繰り出すリアフォーカス式の3群ズームレンズが頻繁に用いられている(例えば、特許文献1、2、3参照)。   In recent years, digital cameras, which are rapidly spreading, use a three-group zoom lens for compactness and good aberration correction, and in particular, a rear focus type three-group zoom lens that extends the final group during focusing. Is frequently used (see, for example, Patent Documents 1, 2, and 3).

特許文献1記載の3群ズームレンズは、物体側から順に、負の屈折力を有する第1レンズ群、正の屈折力を有するとともに明るさ絞りを有する第2レンズ群、および正の屈折力を有する第3レンズ群を配設してなり、広角端から望遠端に向かって変倍する際に、第1レンズ群は、像側へ移動させた後に反転して物体側へ向かって移動させることにより移動軌跡が像側に凸弧状となるように移動させ、第2レンズ群は、物体側へ単調に移動させ、第3レンズ群は、物体側へ移動させた後に反転して像側へ向かって移動させることにより移動軌跡が物体側に凸弧状となるように移動させるように構成されている。   The three-group zoom lens described in Patent Document 1 includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power and a brightness stop, and a positive refractive power. A third lens group that includes the first lens group, and when zooming from the wide-angle end to the telephoto end, the first lens group is moved toward the image side and then reversed and moved toward the object side. Is moved so that the movement locus becomes a convex arc shape on the image side, the second lens group is moved monotonically to the object side, and the third lens group is moved to the object side and then reversed to move toward the image side. The movement trajectory is configured to move toward the object side in a convex arc shape.

特許文献2記載の3群ズームレンズは、物体側から順に、負の屈折力を有する第1レンズ群、正の屈折力を有する第2レンズ群、および正の屈折力を有する第3レンズ群を配設してなり、広角端から望遠端に向かって変倍する際に無限遠物体に合焦させた状態で、第3レンズ群は、像面側に単調あるいは像面側に凸状の軌跡を描いて移動するように構成されている。   The three-group zoom lens described in Patent Document 2 includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power. The third lens group is monotonic on the image plane side or convex locus on the image plane side while being focused on an object at infinity when zooming from the wide-angle end to the telephoto end. It is configured to move by drawing.

特開平10−133115号公報JP-A-10-133115 特開2001−296476号公報JP 2001-296476 A 特開2003−35868号公報JP 2003-35868 A

上記従来の3群ズームレンズは、小型化、高変倍化、および高解像力化を達成しようとしたものであるが、近年においては、さらなる小型化、高変倍化、および高解像力化が望まれている。   The conventional three-group zoom lens is intended to achieve miniaturization, high zoom ratio, and high resolution, but in recent years, further miniaturization, high zoom ratio, and higher resolution are desired. It is rare.

また、上記特許文献1記載の3群ズームレンズは、第1レンズ群の焦点距離が広角端において全系の焦点距離の絶対値の2.4〜2.6倍程度となっており、変倍比が3倍程度までは小型化、高変倍化、および高解像力化という要請を満たすことができるが、変倍比が3倍を超えると、レンズ全長が長くなりコンパクト化という要請を満たすことができなくなる。   Further, in the three-group zoom lens described in Patent Document 1, the focal length of the first lens group is about 2.4 to 2.6 times the absolute value of the focal length of the entire system at the wide angle end. If the ratio is up to about 3 times, the requirements for miniaturization, high zoom ratio, and high resolution can be satisfied, but if the zoom ratio exceeds 3 times, the total lens length becomes long and the demand for compactness must be satisfied. Can not be.

また、上記特許文献2記載の3群ズームレンズは、変倍時における第3レンズ群が像面側に凸の軌跡を描き、あるいは像面側へ単調に移動されるため、変倍比が3倍程度までは小型化、高変倍化、および高解像力化という要請を満たすことができるが、変倍比が3倍を超えると、中間倍率における像面湾曲の補正が困難となる。   In the three-group zoom lens described in Patent Document 2, the third lens group at the time of zooming has a convex locus on the image plane side or is moved monotonously to the image plane side. Although it is possible to satisfy the demands of downsizing, high zoom ratio, and high resolution up to about double, if the zoom ratio exceeds three times, it becomes difficult to correct field curvature at an intermediate magnification.

本発明は、上述した事情に鑑み提案されたもので、変倍比が3倍を超える3群ズームレンズにおいて、コンパクト化および高解像力化を図ることを目的とする。   The present invention has been proposed in view of the above-described circumstances, and an object of the present invention is to achieve compactness and high resolution in a three-group zoom lens having a zoom ratio exceeding 3 times.

本発明の3群ズームレンズは、上記目的を達成するため、物体側から順に、負の屈折力を有する第1レンズ群、正の屈折力を有するとともに光量調節用の絞りを有する第2レンズ群、および正の屈折力を有する第3レンズ群を配設してなり、
広角端から望遠端に向かって変倍する際に、前記第1レンズ群は、前記第2レンズ群に相対的に近づくように移動させ、前記第2レンズ群は、単調に物体側へ移動させ、前記第3レンズ群は、物体側へ移動させた後に反転して像側へ向かって移動させることにより移動軌跡が物体側に凸弧状となるように移動させるとともに、物体距離を無限遠とした場合に、広角端における位置を望遠端における位置よりも物体側とし、
無限遠から近距離へ向かってフォーカシングする際に、前記第3レンズ群を物体側へ向かって移動させてなる3群ズームレンズにおいて、
前記第1レンズ群は、少なくとも1面が非球面とされるとともに像側に曲率の大きい凹面を向けた負の屈折力を有するレンズ、および物体側に曲率の大きい凸面を向けた正の屈折力を有するメニスカスレンズからなり、
下記条件式(1)および(2)を満足してなることを特徴とするものである。
2.0<|f|/f<2.4 ・・・ (1)
0.29<f/f<0.37 ・・・ (2)
ただし、
:広角端における全系の焦点距離
:第1レンズ群の焦点距離
:第2レンズ群の焦点距離
:第3レンズ群の焦点距離
In order to achieve the above object, the three-group zoom lens of the present invention, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power and a diaphragm for adjusting the amount of light. And a third lens group having a positive refractive power,
When zooming from the wide-angle end to the telephoto end, the first lens group is moved so as to be relatively close to the second lens group, and the second lens group is moved monotonously to the object side. The third lens group is moved to the object side and then reversed and moved toward the image side so that the movement locus becomes a convex arc shape on the object side, and the object distance is set to infinity. In this case, the position at the wide-angle end is set to the object side relative to the position at the telephoto end,
In a three-group zoom lens in which the third lens group is moved toward the object side during focusing from infinity to a short distance,
The first lens group includes a lens having at least one aspherical surface and a negative refractive power having a concave surface having a large curvature on the image side, and a positive refractive power having a convex surface having a large curvature on the object side. A meniscus lens having
The following conditional expressions (1) and (2) are satisfied.
2.0 <| f 1 | / f w <2.4 (1)
0.29 <f 2 / f 3 <0.37 (2)
However,
f w : Focal length of the entire system at the wide angle end f 1 : Focal length of the first lens group f 2 : Focal length of the second lens group f 3 : Focal length of the third lens group

また、本発明の3群ズームレンズは、前記構成に加えて、下記条件式(3)を満足してなることが好ましい。
2.7<LT/(f・Z・tanω)<3.3 ・・・ (3)
ただし、
LT:望遠端における第1レンズ群の最も物体側の面と像面との光軸間隔
Z:変倍比
ω:広角端における最大像高での半画角
In addition to the above configuration, the third group zoom lens according to the present invention preferably satisfies the following conditional expression (3).
2.7 <LT / (f w · Z · tanω) <3.3 ··· (3)
However,
LT: optical axis distance between the most object side surface of the first lens unit at the telephoto end and the image plane Z: zoom ratio ω: half angle of view at maximum image height at the wide angle end

また、本発明の3群ズームレンズは、前記構成に加えて、前記第2レンズ群は、両凸レンズと物体側に曲率の大きい凹面を向けた負の屈折力を有するレンズとの接合レンズ、および少なくとも1面が非球面とされるとともに負の屈折力を有する単レンズからなることが好ましい。   Further, in the three-group zoom lens of the present invention, in addition to the above configuration, the second lens group includes a cemented lens of a biconvex lens and a lens having a negative refractive power with a concave surface having a large curvature facing the object side, and It is preferable that at least one surface is an aspherical surface and is composed of a single lens having negative refractive power.

また、本発明の3群ズームレンズは、前記構成に加えて、前記第3レンズ群は、少なくとも1面が非球面とされた正の屈折力を有する1枚のレンズからなることが好ましい。   In the three-group zoom lens according to the present invention, in addition to the above configuration, it is preferable that the third lens group includes a single lens having a positive refractive power and at least one surface being an aspherical surface.

本発明の3群ズームレンズによれば、変倍に際して第3レンズ群を物体側に凸弧状を描くように移動させることにより、変倍比が3倍を超えると像面湾曲の補正が難しい中間倍率においても、像面湾曲を良好に補正することができる。   According to the three-group zoom lens of the present invention, it is difficult to correct curvature of field when the zoom ratio exceeds three times by moving the third lens group so as to draw a convex arc on the object side during zooming. Even at the magnification, the field curvature can be favorably corrected.

また、物体距離を無限遠とした場合に、広角端における第3レンズ群の位置を望遠端における第3レンズ群の位置よりも物体側とするとともに、無限遠から近距離へ向かってフォーカシングする際に、第3レンズ群を物体側へ向かって移動させることにより、変倍時およびフォーカシング時における第3レンズ群の移動量を低減して、コンパクト化を図ることができる。   When the object distance is set to infinity, the position of the third lens group at the wide-angle end is set to the object side with respect to the position of the third lens group at the telephoto end, and focusing is performed from infinity to a short distance. By moving the third lens group toward the object side, the amount of movement of the third lens group at the time of zooming and focusing can be reduced to achieve compactness.

また、所定の条件式(1)および(2)を満足することにより、変倍比が3倍を超える場合にもコンパクト化および高解像力化を達成することができる。   In addition, by satisfying the predetermined conditional expressions (1) and (2), it is possible to achieve compactness and high resolution even when the zoom ratio exceeds three times.

以下、本発明の3群ズームレンズの代表的な実施形態について、図1に示す実施例1を参照して説明する。   A typical embodiment of the three-group zoom lens according to the present invention will be described below with reference to Example 1 shown in FIG.

図1は、本発明の実施例1に係る3群ズームレンズのレンズ構成を示すもので、上段は広角端におけるレンズ構成図、下段は望遠端におけるレンズ構成図である。また、中段には、広角端から望遠端に至る各レンズ群の移動軌跡を示してある。   FIG. 1 shows the lens configuration of a three-group zoom lens according to Example 1 of the present invention. The upper diagram shows the lens configuration at the wide-angle end, and the lower diagram shows the lens configuration at the telephoto end. The middle row shows the movement locus of each lens unit from the wide-angle end to the telephoto end.

本発明の実施形態に係る3群ズームレンズは、図1に示すように、物体側から順に、負の屈折力を有する第1レンズ群G、正の屈折力を有するとともに光量調節用の絞りSを有する第2レンズ群G、および正の屈折力を有する第3レンズ群Gを配設してなる。 As shown in FIG. 1, the three-group zoom lens according to the embodiment of the present invention includes, in order from the object side, a first lens group G 1 having a negative refractive power, a positive refractive power, and a diaphragm for adjusting the light amount. A second lens group G 2 having S and a third lens group G 3 having positive refractive power are arranged.

また、広角端から望遠端に向かって変倍する際に、各レンズ群を以下のように移動させる。すなわち、第1レンズ群Gは、第2レンズ群Gに相対的に近づくように移動させ、第2レンズ群Gは、単調に物体側へ移動させ、第3レンズ群Gは、物体側へ移動させた後に反転して像側へ向かって移動させることにより物体側に凸弧状を描くように移動させる。また、物体距離を無限遠とした場合に、広角端における第3レンズ群Gの位置を望遠端における位置よりも物体側とする。 Further, when zooming from the wide-angle end to the telephoto end, each lens group is moved as follows. That is, the first lens group G 1 moves so as to approach relatively to the second lens group G 2, the second lens group G 2 is monotonously moved toward the object side, the third lens group G 3 is After moving to the object side, it is reversed and moved toward the image side to move it in a convex arc shape on the object side. Further, when the object distance infinity, and the object side than the position of the position of the third lens group G 3 at the wide-angle end at the telephoto end.

さらに、無限遠から近距離へ向かってフォーカシングする際に、第3レンズ群Gを物体側へ向かって移動させる。
このように、3つのレンズ群G、G、Gを光軸Xに沿って移動せしめることで全系の焦点距離fを変化させるとともに光束を結像面上に効率良く集束させることができる。
Further, when the focusing toward infinity to a close, moving the third lens group G 3 toward the object side.
In this way, by moving the three lens groups G 1 , G 2 , and G 3 along the optical axis X, the focal length f of the entire system can be changed, and the luminous flux can be efficiently focused on the imaging surface. it can.

また、第6レンズLと結像面(CCD撮像面)の間にはローパスフィルタや赤外線カットフィルタを含むフィルタ部1が配されている。 Between the sixth lens L 6 and the image plane (CCD imaging surface) filter unit 1 including a low pass filter or an infrared cut filter is arranged.

また、第1レンズ群Gは、物体側から順に、少なくとも1面が非球面とされるとともに像側に曲率の大きい凹面を向けた負の屈折力を有する第1レンズL、および物体側に曲率の大きい凸面を向けた正の屈折力を有するメニスカス形状の第2レンズLからなる。
第1レンズ群Gをこのような構成とすることにより、像面湾曲、歪曲収差等を良好に補正することができ、高解像化を図りつつレンズ全系の厚みと沈胴時の厚みを小さくしてコンパクト化を図ることができる。
The first lens group G 1 includes, in order from the object side, a first lens L 1 having a negative refractive power in which at least one surface is aspheric and a concave surface having a large curvature is directed to the image side, and the object side and a second lens L 2 of meniscus shape having a positive refractive power with a large convex curvature.
By the first lens group G 1 with such a configuration, the field curvature, it is possible to excellently correct distortion and the like, the thickness at thick and collapsed the entire lens system while achieving high resolution Smaller and more compact.

また、第2レンズ群Gは、物体側から順に、光量調節用の絞りS、両凸の第3レンズL、物体側に曲率の大きい凹面を向けた負の屈折力を有する第4レンズL、および少なくとも1面が非球面とされるとともに負の屈折力を有する第5レンズLからなり、第3レンズLと第4レンズLは互いにレンズ面が接合された接合レンズとされている。
第2レンズ群Gをこのような構成とすることにより、球面収差を良好に補正することができ、高解像化を図りつつレンズ全系の厚みと沈胴時の厚みを小さくしてコンパクト化を図ることができる。
The second lens group G 2 includes, in order from the object side, aperture for adjusting the amount of light S, the third lens L 3 of the double-convex, the fourth lens having a negative refractive power with a large concave curvature on the object side L 4 and a fifth lens L 5 having at least one aspherical surface and having negative refractive power, and the third lens L 3 and the fourth lens L 4 are a cemented lens having a lens surface cemented with each other. Has been.
By the second lens group G 2 with such a configuration, it is possible to satisfactorily correct spherical aberration, compact to reduce the thickness at the time of the thickness and collapsed the entire lens system while achieving high resolution Can be achieved.

また、第3レンズ群Gは、少なくとも1面が非球面とされた正の屈折力を有する第6レンズLからなる。
第3レンズ群Gをこのような構成とすることにより、変倍時における収差変動を抑えつつコンパクト化を図ることができる。
The third lens group G 3 is composed of a sixth lens L 6 having a positive refractive power, at least one surface is aspherical.
By the third lens group G 3 with such a configuration, it can be made compact while suppressing the aberration fluctuation during zooming.

なお、各非球面は、下記非球面式により表される。   Each aspheric surface is represented by the following aspheric expression.

Figure 0004450307
Figure 0004450307

本実施形態においては、近年の光学系に対する高解像力化の要請およびコンピュータ性能の向上等の社会的事情を背景として、従来の低次の偶数次項のみならず、奇数次項をも用いて非球面形状を規定している。   In the present embodiment, the aspherical shape using not only the conventional low-order even-order terms but also the odd-order terms, against the background of social circumstances such as the recent demand for higher resolution for optical systems and improved computer performance, etc. Is stipulated.

このように、奇数次項を含む非球面係数を用いることにより、非球面形状を決定するパラメータが増加するため、この非球面の光軸を含む中央領域と、周辺領域との各形状をそれぞれ独立して決定することが可能となり、中央領域および周辺領域共に、良好に収差補正を行うことが可能な形状に形成することが可能となる。   In this way, by using an aspheric coefficient including odd-order terms, the parameters for determining the aspheric shape increase, so that the shape of the central region including the optical axis of the aspheric surface and the peripheral region are independent of each other. Therefore, both the central region and the peripheral region can be formed in a shape capable of satisfactorily correcting aberrations.

本実施形態に係る3群ズームレンズは、下記条件式(1)および(2)を満足し、さらに下記条件式(3)を満足することが好ましい。
2.0<|f|/f<2.4 ・・・ (1)
0.29<f/f<0.37 ・・・ (2)
2.7<LT/(f・Z・tanω)<3.3 ・・・ (3)
ただし、
:広角端における全系の焦点距離
:第1レンズ群の焦点距離
:第2レンズ群の焦点距離
:第3レンズ群の焦点距離
LT:望遠端における第1レンズ群の最も物体側の面と像面との光軸間隔
Z:変倍比
ω:広角端における最大像高での半画角
The three-group zoom lens according to the present embodiment preferably satisfies the following conditional expressions (1) and (2), and further satisfies the following conditional expression (3).
2.0 <| f 1 | / f w <2.4 (1)
0.29 <f 2 / f 3 <0.37 (2)
2.7 <LT / (f w · Z · tanω) <3.3 ··· (3)
However,
f w: the focal length of the entire system at the wide angle end f 1: focal length of the first lens group f 2: the second focal length of the lens unit f 3: the third focal length of the lens unit LT: first lens group at the telephoto end The optical axis distance between the most object-side surface and the image plane of the lens Z: Scaling ratio ω: Half field angle at the maximum image height at the wide-angle end

次に、各条件式(1)、(2)および(3)の意義について説明する。   Next, the significance of the conditional expressions (1), (2) and (3) will be described.

条件式(1)は、第1レンズ群Gの焦点距離の絶対値|f|と広角端における全系の焦点距離fの比|f|/fの値を規定することにより、コンパクト化を図りつつ像面湾曲を良好に補正するための条件式である。
この条件式(1)において、|f|/fの値が下限を超えると、コンパクト化を図ることはできるが像面湾曲を良好に補正することが困難となる。一方、|f|/fの値が上限を超えると、像面湾曲を良好に補正することはできるがコンパクト化を図ることが困難となる。
Conditional expression (1) defines the ratio | f 1 | / f w of the absolute value | f 1 | of the focal length of the first lens group G 1 and the focal length f w of the entire system at the wide angle end. This is a conditional expression for satisfactorily correcting field curvature while achieving compactness.
In this condition (1), | f 1 | when the value of / f w exceeds the lower limit, although it is possible to downsize it is difficult to satisfactorily correct field curvature. On the other hand, | f 1 | when the value of / f w exceeds the upper limit, although it is possible to effectively correct field curvature becomes difficult to achieve compactness.

条件式(2)は、第2レンズLの焦点距離fと第3レンズLの焦点距離fの比f/fの値を規定することにより、コンパクト化を図りつつ球面収差および像面湾曲を良好に補正するための条件式である。
この条件式(2)において、f/fの値が下限を超えると、コンパクト化を図ることはできるが第2レンズ群Gの屈折力が大きくなって球面収差が悪化しかつ像面湾曲が拡大する。一方、f/fの値が上限を超えると、第2レンズ群Gの屈折力が小さくなって球面収差および像面湾曲を良好に補正することはできるがコンパクト化を図ることが困難となる。
Condition (2), by defining the focal length f 2 of the second lens L 2 to the value of the ratio f 2 / f 3 a focal length f 3 of the third lens L 3, the spherical aberration while achieving downsizing And a conditional expression for favorably correcting curvature of field.
In this conditional expression (2), if the value of f 2 / f 3 exceeds the lower limit, it is possible to reduce the size, but the refractive power of the second lens group G 2 increases, the spherical aberration deteriorates, and the image plane The curvature expands. On the other hand, if the value of f 2 / f 3 exceeds the upper limit, the refractive power of the second lens group G 2 can be reduced and spherical aberration and curvature of field can be corrected well, but it is difficult to achieve compactness. It becomes.

条件式(3)は、望遠端における第1レンズ群Gの最も物体側の面と像面との光軸間隔LTと、広角端における全系の焦点距離f、変倍比Z、および広角端における最大像高での半画角ωの積との比LT/(f・Z・tanω)の値を規定することにより、コンパクト化を図りつつ像面湾曲等を良好に補正するための条件式である。
この条件式(3)において、LT/(f・Z・tanω)の値が下限を超えると、変倍比が3倍以上のズームレンズにおいて、コンパクト化を図ることはできるが像面湾曲等を良好に補正することが困難となる。一方、LT/(f・Z・tanω)の値が上限を超えると、変倍比が3倍以上のズームレンズにおいて、像面湾曲等を良好に補正することはできるがコンパクト化を図ることが困難となる。
Condition (3), the optical axis distance LT between the most object-side surface and the image surface of the first lens group G 1 at the telephoto end, the focal length f w of the whole system at the wide-angle end, the zoom ratio Z, and by defining the value of the ratio LT / (f w · Z · tanω) of the product of half angle ω at the maximum image height at the wide angle end, in order to satisfactorily correct field curvature and the like while achieving downsizing This is a conditional expression.
In this condition (3), LT / exceeds the value lower limit of (f w · Z · tanω) , the zoom ratio of more than three times the zoom lens, can be made compact field curvature etc. It is difficult to correct the above. On the other hand, when the value of the LT / (f w · Z · tanω) exceeds the upper limit, the zoom ratio of more than three times the zoom lens, although it is possible to effectively correct field curvature and the like be made compact It becomes difficult.

<実施例1>
以下、本発明の実施例1に係る3群ズームレンズの具体的構成について説明する。
実施例1に係る3群ズームレンズは、上述したレンズ構成を備えている。
<Example 1>
Hereinafter, a specific configuration of the three-group zoom lens according to Example 1 of the present invention will be described.
The three-group zoom lens according to Example 1 has the lens configuration described above.

具体的には、第1レンズ群Gは、物体側から順に、像側に曲率の大きい凹面を向けた負のメニスカス形状を有する第1レンズL、および物体側に曲率の大きい凸面を向けた正のメニスカス形状を有する第2レンズLからなる。また、第1レンズLの両面は、偶数次項と奇数次項の双方に値を有する上記非球面式で表される非球面とされている。 Specifically, the first lens group G 1 has, in order from the object side, a first lens L 1 having a negative meniscus shape with a concave surface having a large curvature facing the image side, and a convex surface having a large curvature facing the object side. positive and a second lens L 2 having a meniscus shape. Further, both surfaces of the first lens L 1 is a non-spherical surface represented by the above aspheric formula having a value in both of the even-order terms and the odd-order terms.

第2レンズ群Gは、物体側から順に、両凸の第3レンズL、物体側に曲率の大きい凹面を向けた負のメニスカス形状を有する第4レンズL、および物体側に凸面を向けた負のメニスカス形状を有する第5レンズLからなり、第3レンズLと第4レンズLは互いにレンズ面が接合された接合レンズとされている。また、第5レンズLの両面は、偶数次項と奇数次項の双方に値を有する上記非球面式で表される非球面とされている。 The second lens group G 2 includes, in order from the object side, a biconvex third lens L 3 , a fourth lens L 4 having a negative meniscus shape with a concave surface having a large curvature facing the object side, and a convex surface on the object side. and a fifth lens L 5 having a negative meniscus, a third lens L 3 fourth lens L 4 is a lens surface to each other is a bonded cemented lens. Further, both surfaces of the fifth lens L 5 is an aspheric surface represented by the above aspheric formula having a value in both of the even-order terms and the odd-order terms.

第3レンズ群Gは、両凸の第6レンズLからなり、その両面は、偶数次項と奇数次項の双方に値を有する上記非球面式で表される非球面とされている。 The third lens group G 3 is composed sixth lens L 6 biconvex, both surfaces are aspherical represented by the above aspheric formula having a value in both of the even-order terms and the odd-order terms.

実施例1に係る3群ズームレンズに関する各数値を下記表1に示す。
表1の上段に、各レンズ面の曲率半径R(mm)、各レンズの中心厚および各レンズ間の空気間隔(以下、これらを総称して軸上面間隔という)D(mm)、各レンズのd線における、屈折率Nおよびアッベ数νの値を示す。
なお、表中の数字は物体側からの順番を表すものである(表2において同じ)。
Table 1 below shows numerical values related to the three-group zoom lens according to Example 1.
In the upper part of Table 1, the radius of curvature R (mm) of each lens surface, the center thickness of each lens, and the air spacing between each lens (hereinafter collectively referred to as the axial top surface spacing) D (mm), The values of the refractive index N and the Abbe number ν in the d-line are shown.
The numbers in the table represent the order from the object side (the same applies in Table 2).

また、表1の中段に、上述した軸上面間隔Dの欄における広角端(f=7.5mm)、中間位置(f=14.3mm)および望遠端(f=27.5mm)のD、D10、およびD12の可変範囲、広角端および望遠端各位置における焦点距離f(mm)、FNOおよび画角2ωの値、前述した条件式(1)、(2)および(3)の値を示す。
本実施例においては、前述した条件式(1)、(2)および(3)は全て満足されている。
Further, in the middle of Table 1, D 4 , D 10 at the wide-angle end (f = 7.5 mm), the intermediate position (f = 14.3 mm), and the telephoto end (f = 27.5 mm) in the column of the shaft upper surface distance D described above, and D variable range of 12, the wide-angle end and the focal length at the telephoto end the position f (mm), the value of F NO and the angle 2 [omega, the above-mentioned conditional expression (1) indicates the value of (2) and (3) .
In the present embodiment, the above-described conditional expressions (1), (2) and (3) are all satisfied.

また、表1の下段に、上記非球面式に示される非球面の各定数K、A、A、A、A、A、A、A、A10の値を示す。 The lower part of Table 1 shows the values of the aspheric constants K A , A 3 , A 4 , A 5 , A 6 , A 7 , A 8 , A 9 , A 10 shown in the above aspheric formula. .

Figure 0004450307
Figure 0004450307

図2は上記実施例1に係る3群ズームレンズの広角端(f=7.5mm)、中間位置(f=14.3mm)および望遠端(f=27.5mm)における諸収差(球面収差、非点収差、ディストーションおよび倍率色収差)を示す収差図である。なお、各球面収差図には、615nm、587.6nm、460nmにおける収差が示されており、各非点収差図には、サジタル像面およびタンジェンシャル像面に対する収差が示されている(図3についても同じ)。この図2から明らかなように、実施例1に係る3群ズームレンズによればズーム領域の全体に亘って良好な収差補正がなされる。   FIG. 2 shows various aberrations (spherical aberration, astigmatism) at the wide-angle end (f = 7.5 mm), the intermediate position (f = 14.3 mm), and the telephoto end (f = 27.5 mm) of the three-group zoom lens according to Example 1 above. FIG. 6 is an aberration diagram showing distortion and lateral chromatic aberration. Each spherical aberration diagram shows aberrations at 615 nm, 587.6 nm, and 460 nm, and each astigmatism diagram shows aberrations with respect to the sagittal image surface and the tangential image surface (see FIG. 3). The same). As can be seen from FIG. 2, according to the three-group zoom lens according to Example 1, good aberration correction is performed over the entire zoom region.

<実施例2>
次に、本発明の実施例2に係る3群ズームレンズの具体的構成について説明する。
<Example 2>
Next, a specific configuration of the three-group zoom lens according to the second embodiment of the present invention will be described.

実施例2に係る3群ズームレンズは、上述した実施例1とほぼ同様のレンズ構成を備えているが、第1レンズLが光軸近傍において両凹形状となっている点が異なっている。
また、第1レンズL、第5レンズL、および第6レンズLの両面は、偶数次項と奇数次項の双方に値を有する上記非球面式で表される非球面とされている。
Three-unit zoom lens according to Example 2 has a lens arrangement nearly similar to that of Example 1 described above, the first lens L 1 is different in that has a biconcave shape in the vicinity of the optical axis .
Further, both surfaces of the first lens L 1 , the fifth lens L 5 , and the sixth lens L 6 are aspherical surfaces represented by the aspherical expression having values in both the even-order terms and the odd-order terms.

実施例2に係る3群ズームレンズに関する各数値を下記表2に示す。
表2の上段に、各レンズ面の曲率半径R(mm)、各レンズの軸上面間隔D(mm)、各レンズのd線における、屈折率Nおよびアッベ数νの値を示す。
Table 2 below shows numerical values related to the third group zoom lens according to Example 2.
The upper part of Table 2 shows the values of the curvature radius R (mm) of each lens surface, the axial top surface distance D (mm) of each lens, and the refractive index N and the Abbe number ν in the d-line of each lens.

また、表2の中段に、上述した軸上面間隔Dの欄における広角端(f=6.5mm)、中間位置(f=11.8mm)および望遠端(f=21.4mm)のD、D10、およびD12の可変範囲、広角端および望遠端各位置における焦点距離f(mm)、FNOおよび画角2ωの値、前述した条件式(1)、(2)および(3)の値を示す。
本実施例においては、前述した条件式(1)、(2)および(3)は全て満足されている。
In the middle of Table 2, D 4 and D 10 at the wide angle end (f = 6.5 mm), the intermediate position (f = 11.8 mm), and the telephoto end (f = 21.4 mm) in the column of the shaft upper surface distance D described above, and D variable range of 12, the wide-angle end and the focal length at the telephoto end the position f (mm), the value of F NO and the angle 2 [omega, the above-mentioned conditional expression (1) indicates the value of (2) and (3) .
In the present embodiment, the above-described conditional expressions (1), (2) and (3) are all satisfied.

また、表2の下段に、上記非球面式に示される非球面の各定数K、A、A、A、A、A、A、A、A10の値を示す。 The lower part of Table 2 shows the values of the aspheric constants K A , A 3 , A 4 , A 5 , A 6 , A 7 , A 8 , A 9 , A 10 shown in the above aspheric formula. .

Figure 0004450307
Figure 0004450307

図3は上記実施例2に係る3群ズームレンズの広角端(f=6.5mm)、中間位置(f=11.8mm)および望遠端(f=21.4mm)における諸収差(球面収差、非点収差、ディストーションおよび倍率色収差)を示す収差図である。この図3から明らかなように、実施例2に係る3群ズームレンズによればズーム領域の全体に亘って良好な収差補正がなされる。   FIG. 3 shows various aberrations (spherical aberration, astigmatism) at the wide-angle end (f = 6.5 mm), the intermediate position (f = 11.8 mm), and the telephoto end (f = 21.4 mm) of the three-group zoom lens according to Example 2 above. FIG. 6 is an aberration diagram showing distortion and lateral chromatic aberration. As is apparent from FIG. 3, the three-group zoom lens according to the second embodiment can satisfactorily correct aberrations over the entire zoom region.

本発明の実施例1に係る3群ズームレンズのレンズ構成図3 is a lens configuration diagram of a three-group zoom lens according to Example 1 of the present invention. FIG. 本発明の実施例1に係る3群ズームレンズの広角端、中間位置および望遠端における諸収差(球面収差、非点収差、ディストーションおよび倍率色収差)を示す収差図FIG. 6 is an aberration diagram showing various aberrations (spherical aberration, astigmatism, distortion, and lateral chromatic aberration) at the wide-angle end, the intermediate position, and the telephoto end of the third zoom lens according to Example 1 of the present invention. 本発明の実施例2に係る3群ズームレンズの広角端、中間位置および望遠端における諸収差(球面収差、非点収差、ディストーションおよび倍率色収差)を示す収差図FIG. 6 is an aberration diagram showing various aberrations (spherical aberration, astigmatism, distortion, and lateral chromatic aberration) at the wide-angle end, the intermediate position, and the telephoto end of the third zoom lens according to Example 2 of the present invention.

符号の説明Explanation of symbols

1 フィルタ部
S 絞り
〜G レンズ群
〜L レンズ
〜R14 レンズ面等
〜D13 軸上面間隔
X 光軸
1 filter unit S aperture G 1 ~G 3 lens group L 1 ~L 6 lens R 1 to R 14 lens surfaces such as D 1 to D 13 axial distance X optical axis

Claims (4)

物体側から順に、負の屈折力を有する第1レンズ群、正の屈折力を有するとともに光量調節用の絞りを有する第2レンズ群、および正の屈折力を有する第3レンズ群を配設してなり、
広角端から望遠端に向かって変倍する際に、前記第1レンズ群は、前記第2レンズ群に相対的に近づくように移動させ、前記第2レンズ群は、単調に物体側へ移動させ、前記第3レンズ群は、物体側へ移動させた後に反転して像側へ向かって移動させることにより移動軌跡が物体側に凸弧状となるように移動させるとともに、物体距離を無限遠とした場合に、広角端における位置を望遠端における位置よりも物体側とし、
無限遠から近距離へ向かってフォーカシングする際に、前記第3レンズ群を物体側へ向かって移動させてなる3群ズームレンズにおいて、
前記第1レンズ群は、少なくとも1面が非球面とされるとともに像側に曲率の大きい凹面を向けた負の屈折力を有するレンズ、および物体側に曲率の大きい凸面を向けた正の屈折力を有するメニスカスレンズからなり、
下記条件式(1)および(2)を満足してなることを特徴とする3群ズームレンズ。
2.0<|f|/f<2.4 ・・・ (1)
0.29<f/f<0.37 ・・・ (2)
ただし、
:広角端における全系の焦点距離
:第1レンズ群の焦点距離
:第2レンズ群の焦点距離
:第3レンズ群の焦点距離
In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power and a diaphragm for adjusting the amount of light, and a third lens group having a positive refractive power are disposed. And
When zooming from the wide-angle end to the telephoto end, the first lens group is moved so as to be relatively close to the second lens group, and the second lens group is moved monotonously to the object side. The third lens group is moved to the object side and then reversed and moved toward the image side so that the movement locus becomes a convex arc shape on the object side, and the object distance is set to infinity. In this case, the position at the wide-angle end is set to the object side relative to the position at the telephoto end,
In a three-group zoom lens in which the third lens group is moved toward the object side during focusing from infinity to a short distance,
The first lens group includes a lens having at least one aspherical surface and a negative refractive power having a concave surface having a large curvature on the image side, and a positive refractive power having a convex surface having a large curvature on the object side. A meniscus lens having
A three-group zoom lens satisfying the following conditional expressions (1) and (2).
2.0 <| f 1 | / f w <2.4 (1)
0.29 <f 2 / f 3 <0.37 (2)
However,
f w : Focal length of the entire system at the wide angle end f 1 : Focal length of the first lens group f 2 : Focal length of the second lens group f 3 : Focal length of the third lens group
下記条件式(3)を満足してなることを特徴とする請求項1記載の3群ズームレンズ。
2.7<LT/(f・Z・tanω)<3.3 ・・・ (3)
ただし、
LT:望遠端における第1レンズ群の最も物体側の面と像面との光軸間隔
Z:変倍比
ω:広角端における最大像高での半画角
The three-unit zoom lens according to claim 1, wherein the following conditional expression (3) is satisfied.
2.7 <LT / (f w · Z · tanω) <3.3 ··· (3)
However,
LT: optical axis distance between the most object side surface of the first lens unit at the telephoto end and the image plane Z: zoom ratio ω: half angle of view at maximum image height at the wide angle end
前記第2レンズ群は、両凸レンズと物体側に曲率の大きい凹面を向けた負の屈折力を有するレンズとの接合レンズ、および少なくとも1面が非球面とされるとともに負の屈折力を有する単レンズからなることを特徴とする請求項1または2記載の3群ズームレンズ。   The second lens group includes a cemented lens of a biconvex lens and a lens having negative refractive power with a concave surface having a large curvature facing the object side, and a single lens having at least one aspherical surface and having negative refractive power. 3. The three-group zoom lens according to claim 1, comprising a lens. 前記第3レンズ群は、少なくとも1面が非球面とされた正の屈折力を有する1枚のレンズからなることを特徴とする請求項1〜のうちいずれか1項記載の3群ズームレンズ。 The third lens group, three-unit zoom lens of any one of claims 1-3, characterized in that it consists of a single lens having a positive refractive power, at least one surface is aspherical .
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